dll/opengl/glu32/src/libnurbs/nurbtess/monoChain.h

   1 /*
   2  * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
   3  * Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
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   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice including the dates of first publication and
  13  * either this permission notice or a reference to
  14  * http://oss.sgi.com/projects/FreeB/
  15  * shall be included in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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  20  * SILICON GRAPHICS, INC. BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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  22  * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  23  * SOFTWARE.
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  26  * shall not be used in advertising or otherwise to promote the sale, use or
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  29  */
  30 /*
  31 */
  32
  33 #ifndef _MONO_CHAIN_H
  34 #define _MONO_CHAIN_H
  35
  36 #include "directedLine.h"
  37 #include "partitionY.h"
  38
  39 class monoChain;
  40
  41 class monoChain{
  42   directedLine* chainHead;
  43   directedLine* chainTail;
  44   monoChain* next;
  45   monoChain* prev;
  46   monoChain* nextPolygon; //a list of polygons
  47
  48   //cached informatin
  49   //bounding box
  50   Real minX, maxX, minY, maxY;
  51   Int isIncrease;
  52
  53   //for efficiently comparing two chains
  54
  55   directedLine* current;
  56
  57 public:
  58   monoChain(directedLine* cHead, directedLine* cTail);
  59   ~monoChain() {}
  60
  61   inline  void setNext(monoChain* n) {next = n;}
  62   inline void setPrev(monoChain* p) {prev = p;}
  63   inline void setNextPolygon(monoChain* np) {nextPolygon = np;}
  64   inline monoChain* getNext() {return next;}
  65   inline monoChain* getPrev() {return prev;}
  66   inline directedLine* getHead() {return chainHead;}
  67   inline directedLine* getTail() {return chainTail;}
  68
  69   inline void resetCurrent() { current = ((isIncrease==1)? chainHead:chainTail);}
  70
  71   void deleteLoop();
  72   void deleteLoopList();
  73
  74   //insert a new chain between prev and this
  75   void insert(monoChain* nc);
  76
  77   Int numChainsSingleLoop();
  78   Int numChainsAllLoops();
  79   monoChain** toArrayAllLoops(Int& num_chains);
  80   Int toArraySingleLoop(monoChain** array, Int index);
  81
  82   Int isKey;
  83   Real keyY; //the current horizotal line
  84   Real chainIntersectHoriz(Real y); //updates current incrementally for efficiency
  85   directedLine* find(Real y);//find dline so that y intersects dline.
  86
  87   void printOneChain();
  88   void printChainLoop();
  89   void printAllLoops();
  90
  91 };
  92
  93 monoChain* directedLineLoopToMonoChainLoop(directedLine* loop);
  94 monoChain* directedLineLoopListToMonoChainLoopList(directedLine* list);
  95 Int MC_sweepY(Int nVertices, monoChain** sortedVertices, sweepRange** ret_ranges);
  96
  97 void MC_findDiagonals(Int total_num_edges, monoChain** sortedVertices,
  98                    sweepRange** ranges, Int& num_diagonals,
  99                    directedLine** diagonal_vertices);
 100
 101 directedLine* MC_partitionY(directedLine *polygons, sampledLine **retSampledLines);
 102
 103 #endif